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一、if条件句二、ifonly,wish,asthough(if)If从句主句did(were)would(could/shouldmight)do过去haddonewould(…)havedone将来①did②weretodo③shoulddowould(…)do*①if从句里有had,should,were,可省略if,把had,should,were提到句首*②用with,without,butfor(要不是)，under…condition(在…条件下)，but,otherwise,or代替if从句*③错综条件句*④注意区分真实条件句常见引导词：if,unless,so/aslongas,incase(that),onconditionthat,suppose(that),supposing(that),provided(that),providing(that)wish/ifonly(如果…就好了)asif/asthoughdid(were)与现在事实相反did(were)haddone过去haddonewould/could/mightdo将来----三、suggest等（should）do/bedone一坚持insist二命令order,command三建议advise(advice),suggest(suggestion),propose(proposal)五要求ask,require(requirement),request,demand,desire,urge.几种常见形式（suggest为例）Manystudentssuggestthat〔thesportsmeetingshouldbeheld.〕（宾从）Itissuggested(bymanystudents)that〔…〕(主从，it形主)Manystudentsmadethesuggestionthat〔…〕（同位从）Manystudents’suggestionisthat〔…〕（表从）Exception（例外）Suggest表示“暗示，表明”Insist表示“坚持说，坚持认为”Theyoungmaninsistedthathehaddonenothingwrongandshouldbesetfree.四、Itistimethatsbdid/shoulddo…ItistimethatIwentnow.ItistimethatIshouldgonow.Itistimeformetogonow.